When I read this story, I wondered how I, as a parent, would feel receiving the news that my child has been killed 8000 miles away. It's a grief I pray I never have to bear. On the other hand, it's a suffering that I long for in my walk with Christ. Justin died doing something eternal--a better decision than living doing something that doesn't matter. He "filled up in his flesh" what was "still lacking in regards to Christ's affliction" [Colossians 1:24]. That is, he bore the bloodshed of Jesus so that his suffering might complete and compliment the suffering testimony of Jesus. In giving his life so that others might live, Justin proved that Christ is better than life and worth death.
Perhaps this is why the martyrs throughout history have considered it a privilege to die for their faith. Because, their wounds are simply mouthpieces of the all-surpassing worth of God for whom they gladly pour out all of their life.